Methods and apparatuses for reducing multipath errors in the demodulation of pseudo-random coded signals
US6493378B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1999 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Jan 6, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2201/70715
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present application is applicable to receivers for Global Positions (GP) systems which use delay-lock loops (DLLs) and, optionally, phase-lock loops (PLLs). The application discloses multipath error reduction techniques which enable the multipath errors in DLL systems to be made much less than the error present in known narrow “early-late” correlators, or their corresponding implementations which use strobe representations of the PR-code. Also disclosed are multipath error reduction techniques that enable multipath errors in the PLL systems to be reduced. The techniques, when applied to both the DLL and PLL systems work synergistically to further reduce multipath errors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.